Abstract
Specific rovibrational levels of the E0g+ ion-pair state of Cl2 have been laser excited by optical–optical double resonance (OODR) via the B0u+ state. A two-color, single-laser visible+ultraviolet (VIS+UV) scheme was used, where the UV radiation was derived by second-harmonic generation from the VIS laser output. Spectrally resolved emission at 240–265 nm was observed. The E0g+→B0u+ spectra exhibited both discrete and continuous (Condon oscillation) parts, from which the E→B electronic transition moment curve Me(R) was derived. It is compared with corresponding results on ion-pair states of I2.
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